<PAGE>



                                                                   Exhibit 13(a)
                                                                   Page 1 of 3


                   NAVISTAR FINANCIAL DEALER NOTE MASTER TRUST
              DEALER NOTE ASSET BACKED CERTIFICATES, SERIES 1998-1
                     ---------------------------------------

             ANNUAL SUMMARY OF SERVICER AND SETTLEMENT CERTIFICATES

              DISTRIBUTION  AND  PERFORMANCE  ANNUAL  AGGREGATE  REPORT  For the
              period July 17, 1998 through October 31, 1998


     Under  the  Series  1998-1  Supplement  dated  as of  July  17,  1998  (the
"Supplement")  by and among  Navistar  Financial  Corporation  ("NFC")  Navistar
Financial  Securities  Corporation ("NFSC") and The Bank of New York, as trustee
(the "Master Trust Trustee") to the Pooling and Servicing  Agreement dated as of
June 8, 1995 (the  "Agreement") by and among NFC, NFSC, the Master Trust Trustee
and The Chase Manhattan Bank, as 1990 Trust Trustee, the Master Trust Trustee is
required  to  prepare  certain   information   each  month   regarding   current
distributions    to   certain    accounts   and   payment   to   Series   1998-1
Certificateholders  as well as the  performance  of the Master  Trust during the
previous  month.  An annual  aggregation of such monthly  reports for the period
July 17,  1998  through  October  31,  1998 with  respect to  distributions  and
performance  of the Trust is set forth  below.  Certain  of the  information  is
presented  on the basis of an original  principal  amount of $1,000 per Investor
Certificate.  Certain  other  information  is presented  based on the  aggregate
amounts  for the  Master  Trust  as a  whole.  Capitalized  terms  used  but not
otherwise  defined herein shall have the meanings  assigned to such terms in the
Agreement and the Supplement.

1.   NFC is Servicer under the Agreement.

2. The undersigned is a Servicing Officer.

3. Eligible Investments in the Excess Funding Account:

     a.  The aggregate amount of funds invested in
         Eligible Investments.............................................$0.00

     b.  Description of each Eligible Investment:................Not Applicable

     c.  The rate of interest applicable to each such Eligible
         Investment..............................................Not Applicable

     d.  The rating of each such Eligible Investment.............Not Applicable


<PAGE>



                                                                   Exhibit 13(a)
                                                                   Page 2 of 3



4.   The total amount to be distributed on the Series 1998-1
     Certificate on the Distribution Dates:

     a.  The total aggregate amount...............................$4,183,353.71

     b.  Stated on the basis of $1,000 original principal amount......$20.91677

5.   The total amount, if any to be distributed on the
     Series 1998-1 Certificates on the Distribution Dates
     allocable to the Invested Amount.....................................$0.00

6.   The total amount, if  any, to be distributed on the
     Series 1998-1 Certificates on the Distribution Date
     allocable to interest on the Series 1998-1 Certificates......$4,183,353.71

7.   The Invested amount as of the Distribution Date.
     (after giving effect to all distributions that
     will occur on the Distribution Date) ......................$200,000,000.00


8.   Eligible Investments in the Series Principal Account:

     a.  The aggregate amount of funds invested in Eligible
         Investments......................................................$0.00

     b.  Description of each Eligible Investment:................Not Applicable

     c.  The rate of interest applicable to each such Eligible
         Investment..............................................Not Applicable

     d.  The rating of each such Eligible Investment.............Not Applicable

9.   Eligible Investments in the Liquidity Reserve Account:

     a.  The aggregate amount of funds invested in Eligible
         Investments......................................................$0.00

     b.  Description of each Eligible Investment:................Not Applicable

     c.  The rate of interest applicable to each such Eligible
         Investment..............................................Not Applicable

     d.  The rating of each such Eligible Investment.............Not Applicable




<PAGE>



                                                                   Exhibit 13(a)
                                                                   Page 3 of 3



10.  The aggregate amount of Dealer Notes issued to finance
     OEM Vehicles, as of the end of the Due Period...............$11,226,142.65

11.  The Dealers with the five largest aggregate
     outstanding  principal amounts of Dealer Notes
     in the 1990 Trust at the end of the period:

     i)    Freund Equipment
     ii)   Southwest International Trucks
     iii)  Pollard Motor Co
     iv)   Longhorn International Eq Inc.
     v)    Southland International Trucks